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Powder and single-crystal x-ray study of chromium chlorine boracite, Cr3B7O13Cl, at low temperature. Powder refinement of the orthorhombic modification at 100 K

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Published in Ferroelectrics. 1992, vol. 132, no. 1-4, p. 239-244
Abstract Cr3B7O13Cl: space group Pca21, a 8.5647(2), b 8.6125(2), c 12.1453(3) .ANG., Rp = 0.0273, RB = 0.0723 was refined from x-ray powder profile data at T = 100 K. Lattice parameters as measured on single-crystals and powders show a discontinuous vol. increase of 0.45% at the cubic-to-tetragonal phase transition at 264 K, but practically no vol. change (<001%) at the tetragonal-to-orthorhombic phase transition at 180 K. The metal coordinations in the orthorhombic low-temp. modification differ less from those in the cubic high-temp. modification than in other boracites.
Keywords Crystal structureChromium chlorine boracite
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Project FNS: 1991
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MAO, Shao Yu et al. Powder and single-crystal x-ray study of chromium chlorine boracite, Cr3B7O13Cl, at low temperature. Powder refinement of the orthorhombic modification at 100 K. In: Ferroelectrics, 1992, vol. 132, n° 1-4, p. 239-244. https://archive-ouverte.unige.ch/unige:31412

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